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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598f42279ba8059621eae58cf030e4b11bf8df5c95df9533cfae28e113205039' 
  AND token = 'APQeoMmFNojxZpZ8/dU0DyZDe1Aj2/v4gWChN5Eg7NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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