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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c569474aa0dc7efc225c37d32aa28ac76e6956628ac717ad032a91bf02a2538f' 
  AND token = 'Bi0mA2p6cTEPw4BoCp2OJsk4BAr93Rz1sFIJe4mKXXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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