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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b025f284953015c750d6f472671311feec1a2f40dec9a03f299cacfc7c92f701' 
  AND token = 'Sz96nqYRzeTb+yE9tPpZh0ky39mWYceUClV3gsXdfN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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