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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4106f50871301f63ee6d5265397ce0ef62e7358e064d7fc412e8e83780623f' 
  AND token = 'W+Q9NPHpo2REP+bPPMLGPjNydaPJv19OYm0/JtczMPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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