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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ee79a05386aa9ba30981dc921f5ce485a976d9f804bb14d326990c5fac805f' 
  AND token = 'nQNMEOvnknw1UjqGsuHQKyGq9OoWYsqWtShwBInapbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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