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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b456172c136c79f406a5ae5b38053423766b088d82b59b39a18755d1538ca830' 
  AND token = 'g30vkO2i/meIZHCg0BN+1G58EMk0ukv9oBJY2bGdxPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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