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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493debc1de369aad2fc9fc5c05bc6fbb870ff2021849d5c5823389158e1cc384' 
  AND token = '370uG+ALiuKujIFbSC5er7UZpkudB8FtkJNUTCuH3yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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