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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62de52f420484dfb0b6714c6640e68e14d0854d568779972334f108e0d6374f3' 
  AND token = 'p/53x4jw+MLYNNXYy6rA5BO9ynFfd58Ww2XAzfsQYjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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