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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7357f8f82d5fdd46a6447898583b7b7c39f7e075cc23bedb715bb5ad14d2c0ca' 
  AND token = '0Cf099zerkiA05AEvM42eoQK4h8MoI6hY9vF4RCn4x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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