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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e745e87d2497564905405cceaa68d6c687890b040126247ccaddc169bfa351b' 
  AND token = 'OxGw7oAEAFWsVCmP9AFu9vvOo2y39YQCt+KaYu52c/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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