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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc25afa05a958a6c42a3593ba628a6bb4b9ca3ea38b81d9ab102d53eda1db6f' 
  AND token = 'UJ85rrwhucWEypOF8BqcuXYfevRNnTkoKgD1+8dobDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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