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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11eef7306df88b42abbc5849a0882944ec236b5fa51bbd4eac8a3a9e57229a5' 
  AND token = 'M+y5+yb5TrLVwpaUVYYHlRk7i+8LxK9UKZjO17NED8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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