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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c070c564107c658997b1aa6e706e69104fa46962df378387be478b8dd12f6872' 
  AND token = '5q0az3zLs2tdGmJJqLC9B1Eli7TBH2wJhhtZJ9U3G9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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