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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bbfb1a2c325113b49c8ae0b4ba6bbc09dd40e71a0863cb116a84ffeeacef24' 
  AND token = 'U8dUNqzlaJnX7bnh52+rnOY7XbTNwLSFwYBfUKcm8x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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