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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634a16b1868501af30cf34164e79054311e825f4b9bfda7ec6da1ddffaa7ad4f' 
  AND token = 'HqxgbFQp2DkfqpNKbVhQUDm+QhOAUlYAfZnjWI8kNdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00133

JSON explain

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