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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbaee3d1d83c520ef19ae0dab5e4c2a917c0eea93e3be18987b04eaa8c09908' 
  AND token = 'L9ugJWoVbjKmr26Mdte1NITAuPR9J/1Qq9bZ9P53vTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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