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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3e83267218208b74019fdba8c5610313b3bd84d0fc247e6699e1400ef778f0' 
  AND token = '8bOw9NWlcIvIRg1hvaQ6GM1yiRWFdWrYLn2yo3S7gPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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