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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a8b4995ab5b55c8b84c29df6acca60a4a741e6ec7d1d6e649477d70bf274d2' 
  AND token = 'P5WnJUvnmtFW3yLNM0dQpkxXWdJ1j7d3lRv5GymzKo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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