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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685ac47286c376dccdf9d7b44003b7bfe9cda2ce491e760e0653ad0d8fe617b7' 
  AND token = 'byvHz9gvNDePgBjs3Er9vJQJ/OmlHTdKoWrYyKJVsMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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