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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbaab8440c4ffd31291451b8f4d04e53c6346d957a5835e9a8dd38fdebaae0f' 
  AND token = 'Wkup9uKdzrxiBP5X8YBKsVwHNcU9rz3Xn4ppr3cMQ+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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