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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6709ba857dfd0d8d6ff088a68421f06b3ae885a797edcc96a59df54d8b75178' 
  AND token = 'fnsosH4bhWTgEeDwlOjm+BuhNXQnBxeGWLj768g5PYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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