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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b043eefc66f7adc0dd4d5e12d0634b731b80914c0258cf0a9509b31fa44db5' 
  AND token = 'mu2auJshccgtVw2y4/NoElsDKhZ0o+60BapmdKIbarY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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