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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f6f13c558e6e0f88f150becc9a032fa7ceac9a79eb386830d64db35c3b4fcb' 
  AND token = 'FX4ySBRdgEdh/yhXxIFo88esp78A+66dSAjjMXFmhWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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