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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c71c3dfe3afa8b3feb0efcd284923c2220b2cb7cc1207565dbff374a08e176e' 
  AND token = 'ABcphfKYzW7wB+NwhwMfDEl/zqeVpla4nYVVfIqgAHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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