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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e3eed84407d7f2c7997e93a82fa94bc80320f9719a63e091603938a362e992' 
  AND token = 'TVayCG7Miu6BOshGLlMQp1W6i1q1R//6xwa/HtP33qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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