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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b205a4f31311b5b31566e330357494e0b81dee6a976a0ec31708c48ccbfc52d' 
  AND token = 'HQe0RPd5iBCjptDJ6WUalEgQmUa0wbSPNL954NJvB+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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