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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfd00f2f0bca827028bdd11f673143601194bf0c2f7ff95f43fbfc24d3f38d2' 
  AND token = 'TWtQdk24Ivae9ARv3BKrG0QE73Ssn3XAXVQTYbs4gx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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