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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388b6df556eb3ebd9f32a1bb7c4f1542d6cdc6fe5654e35193d975e97930467e' 
  AND token = 'r8bBE6/EQrp6AHRf+fHcK1zK04Gjxg7bIPkE9pbV5FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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