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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412e0148f15451735b416b596dbac4fe24282aac5b189e6e1850ca4922ac4129' 
  AND token = 'Mj0hRz5d4p7YPCIRNIOKpv19V/9ewmPBNdFyAQ5geNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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