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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0575132febab3ce73dffb30def90dfe37cff615925806d26d817a27bc52b1aea' 
  AND token = 'x4C9a2DmRL7xYUIyCrjuKOKHr4/HApIrjAADUzDbzCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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