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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d5885f54872cbe8fa6e5a0cbb35b058c690e525a529d51b3d30267576ca6c9' 
  AND token = '34xwoR6KExVxEfcYUo5qDE6DaEEelzovmT00plUBTP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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