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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307f0d76ecf904246963adff61d9616a737df317355b46917ca965ffbfca416f' 
  AND token = 'T8TXuCr7vejWQ2O92dFY8s6JwU8K484ULyoQErLkVOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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