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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7386068c6f60619324b4ac8d32ab8614adab58482160103ad3f5290b1eced464' 
  AND token = 'ULHeohzc0IwkmOEVgB6xUXD0+7AfjSsYCSPKnk2DNxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}