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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84fbfba1d6de8d393e7b345cca7db0ef8667569e17389fc5f51779fa59423e1' 
  AND token = 'a4OL5+VL/E+gLtWliE1++cEhoCEaxqHLAp6Jj/cP4s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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