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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa8b5aaf521c6fbc947c58b30985c43469991976b3ea9da41ae2b82fca52eb8' 
  AND token = 'vF4IV+ZQT3tdSTmrQ91ZzANeAIi3AeGyWofPh35u06I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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