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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50bae486cbb4f9583775f447ed0b8a5e50afd27f8a68102682e10027e2d0357' 
  AND token = 'y2pq3DDm/jU5inAGyOyUOvvGcefz6xGvwbEFcLMmnzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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