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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef38340a9964bebdd8b4e6ff3ec40c69c89f04bc4b9d45af1b3da5942eaa8506' 
  AND token = '390oZ1GvOPD9FbEljuI63BQJUA4eZttn5JaZAvGGTsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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