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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0070490ef7c7b2601ae085f2c2f2c6fbd59c0cd139872c4f6b1041c796f551f' 
  AND token = 'bkQPBr0W25hMe32Op/ChRQVyoqJD6+2Bgj7IiZqPDsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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