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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbd9dc39495a3f42833ce84c7a57284d78f684d8f8599dfc10ce369adb9ad0d' 
  AND token = 'XtQC+kVobs4/DDKLTDFtpL5hO5l7FOhF54WVLuweX2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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