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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b5112ba930197aa058ea01e694c790b81911f5b716c7c7f630bd0cd6425878' 
  AND token = 'cYkGsS1MYDdJdWOq9qgQaBMujU171BPA08lEl3m18Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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