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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e8458e2cbedccf89915f00e99689ead4855dbd9d30211d068fad18fb7c59e4' 
  AND token = 'NVHT3zrz0RAi603iZXfbYPrvobXTB6muYjBskCxrH6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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