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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28413dcd56af7134e1ccdf577b2e1fe8c7438867c51f5af701ff36db2fe5119c' 
  AND token = 'TkG7mMMkv/tH+CD56Ul+X+fj5xcxM6uwT8tx+6sd4VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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