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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd717913c741bc9bd299a235955ec2749b4a6f9223b5559debc7d3745dc0cb4e' 
  AND token = 'b60wEo6hydsbNBCdk5fV+Wz6WLUoJu0l68md24hbnXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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