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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929ce0e14524f76725cfab994f6b98f304f7830aaa9d35bf427e83dbda3c2f65' 
  AND token = '2N9G+1O/URMEpbO8Q9Y7SsNgTTCGrMztiSzLATlc0qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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