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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4034829d94f8e15b364f0c71bbbc0d8c013be41bfbf1ebe2a7a5bb192f2e3d4c' 
  AND token = 'qCQFu2R4d8UqpchhkJVliNyDz7zlcUeEOdCnlsoF3Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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