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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9662392ac7904b4ad6f2211c23ac8153ba2bd687cf58f25c7ba7aa88a0bc47bc' 
  AND token = 'MkPzegsHUmGimbhLoZmv2YXvWdYa42Q2+J0YPotLgSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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