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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe14d889f3e43b8b06b27354a57b5db6ee1b9ca46153c84ce62adc9a54d57b4' 
  AND token = '2+MGxv/cyvXjbrly7M9s+k3SRZflZ+7R+JCg/h4x7GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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