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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e570582443dff9bf18d7e9a4a066784022f6717f2acedb16c694e3b51c242c' 
  AND token = 'qsCYAR5Sej/ed0gNC440ELFo95vGbM058EUKZh7z9ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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